Balancing apparatus for elevator

Abstract

A balancing apparatus includes a frame body ( 1 ), a first weight ( 2 ) and a second weight ( 3 ) separated from each other vertically in the frame body ( 1 ). The first weight ( 2 ) is connected to the frame body ( 1 ) through elastic bodies ( 41, 42 ). The elastic bodies ( 41, 42 ) are always subjected to compression load. The first and second weights ( 2, 3 ) are accommodated together in the frame body ( 1 ). Since tensional load is not applied to the elastic bodies ( 41, 42 ), the durability of the balancing apparatus can be ensured.

1 . A balancing apparatus for an elevator having an elevator car for passengers, comprising: 
 a frame body connected to the elevator car through a main cable; and    a balancing weight accommodated in the frame body, the balancing weight having a first weight and a second weight separated from each other vertically in the frame body, wherein    the first weight is positioned above the second weight and is supported by the frame body through a dynamic vibration absorber under the first weight.    
   
   
       2 . The balancing apparatus of  claim 1 , wherein the dynamic vibration absorber includes at least one elastic body.  
   
   
       3 . The balancing apparatus of  claim 2 , wherein the dynamic vibration absorber further includes a damper.  
   
   
       4 . The balancing apparatus of  claim 2 , wherein 
 the dynamic vibration absorber includes upper and lower elastic bodies between which the first weight is interposed, and    the first weight is connected to the frame body through the upper elastic body.    
   
   
       5 . The balancing apparatus of  claim 4 , wherein 
 the dynamic vibration absorber further includes a damper juxtaposed to the upper elastic body.    
   
   
       6 . The balancing apparatus of  claim 2 , further comprising a sheave rotatably arranged in the frame body, wherein 
 the first weight is connected to the sheave, and    either the sheave or the first weight is connected to the frame body through the elastic body arranged on the sheave or the first weight.    
   
   
       7 . The balancing apparatus of  claim 3 , further comprising a sheave rotatably arranged in the frame body, wherein 
 the first weight is connected to the sheave, and    either the sheave or the first weight is connected to the frame body through the elastic body arranged on the sheave or the first weight and the damper juxtaposed to the elastic body.    
   
   
       8 . The balancing apparatus of  claim 1 , wherein at least one of the first weight and the second weight is formed by a lamination of weight members.  
   
   
       9 . The balancing apparatus of  claim 1 , further comprising a slide member or a rotating member interposed between the frame body and the first weight and able to be moved up and down due to expansion and contraction of the dynamic vibration absorber.